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23 September 1998 Photoinduced liquid crystal anchoring transition on polysiloxane-based aligning surface
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Proceedings Volume 3488, Nonlinear Optics of Liquid and Photorefractive Crystals II; (1998) https://doi.org/10.1117/12.323701
Event: International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 1997, Partenit, Crimea, Ukraine
Abstract
We report a novel azimuthal anchoring transition of nematic liquid crystal on a polysiloxane-cinnamate treated surface under the UV irradiation. It is found, that the direction of the light-induced easy axis strongly depends on the irradiation time. Under short exposure times the orienting surface provides an orientation of LC parallel to the direction of the uV light polarization. Longer times give the orthogonal to the UV polarization orientation of LC. There is region of exposure times that give a bistable anchoring conditions and domains with different directions of the director orientation. We propose a phenomenological model of this anchoring transition and surface bistability based on the competition between trans-cis isomerization of the side fragments of the polysiloxane-cinnamate material and cross-linking photoreaction of the transform of side fragments resulting in orthogonal molecular easy axes.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Denis Andrienko, Andrey Dyadyusha, Yuri Kurioz, Victor Yu. Reshetnyak, and Yuri A. Reznikov "Photoinduced liquid crystal anchoring transition on polysiloxane-based aligning surface", Proc. SPIE 3488, Nonlinear Optics of Liquid and Photorefractive Crystals II, (23 September 1998); https://doi.org/10.1117/12.323701
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